What are the key points of fertilization techniques for out-of-season vegetables?

For growing vegetables out of season, it is not only necessary to have the hardware such as greenhouses and solar greenhouses in place, but fertilization techniques are also very important. There is still a slight difference between fertilizing out-of-season vegetables and seasonal fertilization methods. Let's take a look together at the key points of fertilizing out-of-season vegetables.

1. Determine the economically optimal fertilizer rate

Determining the economically optimal fertilizer rate is premised on meeting the needs of the vegetables, and is calculated according to the market yield level and soil fertility level. For example, when soil nutrients can meet the needs of the vegetables, in order to ensure the fertilizer supply intensity, the fertilizer rate can be calculated at 20%-40% of the vegetable yield. When fertilizing, chloride-type fertilizers are generally not chosen, and volatile nitrogen fertilizers should not be used; nitrate nitrogen should be controlled as much as possible. For vegetables with a short growth period or those harvested for their roots, stems and leaves, 12%-13% of the nitrogen fertilizer, all of the phosphorus, potassium and trace fertilizers can be used as a base fertilizer, and the nitrogen fertilizer can be used as a top dressing applied in split doses during the peak growth period.

2. Apply heavy amounts of organic fertilizer

Choose fully decomposed high-quality organic fertilizer and apply it as a base fertilizer one month before covering the greenhouse. The application rate is generally 1-1.5 times that of open fields, and at the same time deep plow year by year to thicken the plow layer and improve the soil structure. In order to prevent ammonia gas and nitrous acid gas poisoning, the organic fertilizer must be fully decomposed when applied, especially chicken manure. Farmyard manure must strictly not be piled up inside the greenhouse for a long time. Organic fertilizer can be used together with inorganic fertilizer, and part of the inorganic fertilizer can also be drawn out for foliar spraying, which is relatively economical and worthwhile.

3. Solve salt damage

For plots where salt damage has already occurred, it can be solved by planting salt-tolerant vegetables such as cabbage, spinach, pumpkin, celery and cauliflower, or by using high-quality organic fertilizer. In addition, replacing the soil to remove salt or flooding the field with water is also very effective.

  The above is an introduction to the key points of fertilizing out-of-season vegetables. We hope it can help you. If you want to learn more related knowledge, please stay tuned to us.